[llvm-branch-commits] [llvm] release/18.x: [X86][Driver] Do not add `-evex512` for `-march=native` when the target doesn't support AVX512 (#91694) (PR #91705)

[Sam James via llvm-branch-commits]

thesamesam wrote:

@tstellar We've had a load of reports from this breaking compiles on machines 
without AVX512 for e.g. LibreOffice, Chromium. Could this be included in .6 
please?

https://github.com/llvm/llvm-project/pull/91705
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